Enclosed alphanumerics (issue #18)

.claude/settings.local.json

@@ -0,0 +1,30 @@
+{
+  "permissions": {
+    "allow": [
+      "WebFetch(domain:github.com)",
+      "WebSearch",
+      "Bash(head:*)",
+      "WebFetch(domain:gitlab.com)",
+      "Bash(java:*)",
+      "Bash(ls:*)",
+      "Bash(jar tf:*)",
+      "Bash(chmod +x:*)",
+      "WebFetch(domain:fontforge.org)",
+      "WebFetch(domain:fonttools.readthedocs.io)",
+      "Bash(grep:*)",
+      "Bash(tail:*)",
+      "Bash(python3:*)",
+      "Bash(make:*)",
+      "Bash(git stash:*)",
+      "Bash(./autokem*)",
+      "Bash(cmp:*)",
+      "Bash(wc:*)",
+      "Bash(pip3:*)",
+      "Bash(pip install:*)",
+      "Bash(.venv/bin/python3:*)",
+      "Bash(.venv/bin/python:*)",
+      "Bash(find:*)",
+      "Skill(update-config)"
+    ]
+  }
+}

.claude/skills/add-unicode-block/SKILL.md

@@ -0,0 +1,93 @@
+---
+name: add-unicode-block
+description: Add a new Unicode script/block to the Terrarum Sans Bitmap font engine.
+---
+# Add Unicode Block
+
+## Required inputs
+
+The user must supply:
+- **Script name** — human-readable name used in constant/function names (e.g. `Ogham`, `LatinExtE`)
+- **TGA filename** — the sprite sheet filename without path (e.g. `ogham_variable.tga`)
+- **Unicode range** — start and end codepoints inclusive (e.g. `U+1680..U+169F`)
+
+If any of these are missing, ask for them before proceeding. Extra directions can be given after Unicode range.
+
+## Step 1 — Determine the next sheet index
+
+Read the sheet index constants from both files to find the current highest index (excluding `SHEET_UNKNOWN = 254`):
+
+- Kotlin: `src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt` — grep for `internal const val SHEET_`
+- Python: `OTFbuild/sheet_config.py` — grep for `^SHEET_`
+
+The new index = highest existing index + 1.
+
+## Step 2 — Derive identifiers
+
+From the script name, derive:
+- **Kotlin constant**: `SHEET_<UPPER_SNAKE>_VARW` (e.g. `SHEET_OGHAM_VARW`)
+- **Kotlin indexY function**: `<camelCase>IndexY` (e.g. `oghamIndexY`)
+- **Python constant**: same as Kotlin constant
+- **Range start hex**: the lower bound codepoint as a `0x`-prefixed Kotlin/Python literal
+
+## Step 3 — Edit both files
+
+Make all 6 edits. Read each section before editing.
+
+### Kotlin: `src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt`
+
+**a) Sheet index constant** — find the block of `internal const val SHEET_*` constants (just before `SHEET_UNKNOWN = 254`) and append:
+```kotlin
+internal const val SHEET_<NAME>_VARW = <INDEX>
+```
+
+**b) fileList entry** — find `internal val fileList` array and append before the closing `)`:
+```kotlin
+"<tga_filename>",
+```
+
+**c) codeRange entry** — find `internal val codeRange` array and append before the closing `)`:
+```kotlin
+0x<START>..<0x<END>, // SHEET_<NAME>_VARW
+```
+Use `+` to combine non-contiguous ranges if needed.
+
+**d) getSheetwisePosition when-branch** — find the `when` block that dispatches to indexY functions (just before `else -> ch / 16`) and append:
+```kotlin
+SHEET_<NAME>_VARW -> <camelCase>IndexY(ch)
+```
+
+**e) indexY function** — find the block of private `*IndexY` functions near the bottom of the companion object and append:
+```kotlin
+private fun <camelCase>IndexY(c: CodePoint) = (c - 0x<START>) / 16
+```
+
+### Python: `OTFbuild/sheet_config.py`
+
+**f) Sheet index constant** — find the block of `SHEET_* = <n>` constants (just before `SHEET_UNKNOWN = 254`) and append:
+```python
+SHEET_<NAME>_VARW = <INDEX>
+```
+
+**g) FILE_LIST entry** — find `FILE_LIST = [` array and append before the closing `]`:
+```python
+"<tga_filename>",
+```
+
+**h) CODE_RANGE entry** — find `CODE_RANGE = [` array and append before the closing `]`:
+```python
+list(range(0x<START>, 0x<END+1>)),                                                  # <INDEX>: <ScriptName>
+```
+
+**i) index_y lambda** — find the dict in `get_index_y(sheet_index, c)` (just before `SHEET_HANGUL: lambda: 0`) and append:
+```python
+SHEET_<NAME>_VARW: lambda: (c - 0x<START>) // 16,
+```
+
+## Step 4 — Verify
+
+After all edits, confirm:
+1. The Kotlin constant, fileList, codeRange, when-branch, and indexY function are all present and consistent.
+2. The Python constant, FILE_LIST, CODE_RANGE, and index_y lambda are all present and consistent.
+3. The indices in both files match.
+4. The range end in `CODE_RANGE` is `end + 1` (Python `range` is exclusive).

OTFbuild/font_builder.py

@@ -332,6 +332,7 @@ def build_font(assets_dir, output_path, no_bitmap=False, no_features=False):
     charstrings[".notdef"] = pen.getCharString()
 
     _unihan_cps = set(SC.CODE_RANGE[SC.SHEET_UNIHAN])
+    _emoji1_cps = set(SC.CODE_RANGE[SC.SHEET_EMOJI1])
     _base_offsets = {}  # glyph_name -> (x_offset, y_offset) for COLR layers
 
     traced_count = 0
@@ -382,6 +383,10 @@ def build_font(assets_dir, output_path, no_bitmap=False, no_features=False):
         if cp in _unihan_cps:
             y_offset -= ((SC.H - SC.H_UNIHAN) // 2) * SCALE
 
+        # Emoji1 glyphs are 16px tall in a 20px cell; same 2px top/bottom padding.
+        if cp in _emoji1_cps:
+            y_offset -= ((SC.H - SC.H_EMOJI1) // 2) * SCALE
+
         # Hangul jungseong/jongseong PUA variants (rows 15-18) have zero
         # advance and overlay the preceding choseong.  Shift their outlines
         # left by one syllable cell width so they render at the same position.

OTFbuild/sheet_config.py

@@ -6,8 +6,10 @@ Ported from TerrarumSansBitmap.kt companion object and SheetConfig.kt.
 # Font metrics
 H = 20
 H_UNIHAN = 16
+H_EMOJI1 = 16
 W_HANGUL_BASE = 13
 W_UNIHAN = 16
+W_EMOJI1 = 17
 W_LATIN_WIDE = 9
 W_VAR_INIT = 15
 W_WIDEVAR_INIT = 31
@@ -81,6 +83,9 @@ SHEET_LATIN_EXTG_VARW = 47
 SHEET_OGHAM_VARW = 48
 SHEET_COPTIC_VARW = 49
 SHEET_CYRILIC_EXTD_VARW = 50
+SHEET_MATHS1_VARW = 51
+SHEET_EMOJI1 = 52
+SHEET_ENCLOSED_ALPHNUM_VARW = 53
 
 SHEET_UNKNOWN = 254
 
@@ -136,6 +141,9 @@ FILE_LIST = [
     "ogham_variable.tga",
     "coptic_variable.tga",
     "cyrilic_extD_variable.tga",
+    "maths1_extrawide_variable.tga",
+    "emoji1.tga",
+    "enclosed_alphanumeric_variable.tga",
 ]
 
 CODE_RANGE = [
@@ -190,6 +198,9 @@ CODE_RANGE = [
     list(range(0x1680, 0x16A0)),                                                    # 48: Ogham
     list(range(0x2C80, 0x2D00)),                                                    # 49: Coptic
     list(range(0x1E030, 0x1E090)),                                                  # 50: Cyrillic Ext D
+    list(range(0x2200, 0x2400)),                                                    # 51: Maths1
+    list(range(0x1F600, 0x1F650)),                                                  # 52: Emoji1
+    list(range(0x2460, 0x2500)),                                                    # 53: Enclosed Alphanum
 ]
 
 CODE_RANGE_HANGUL_COMPAT = range(0x3130, 0x3190)
@@ -271,6 +282,8 @@ def get_cell_width(sheet_index):
         return W_VAR_INIT + HGAP_VAR  # 16
     if sheet_index == SHEET_UNIHAN:
         return W_UNIHAN
+    if sheet_index == SHEET_EMOJI1:
+        return W_EMOJI1
     if sheet_index == SHEET_HANGUL:
         return W_HANGUL_BASE
     if sheet_index == SHEET_CUSTOM_SYM:
@@ -283,6 +296,8 @@ def get_cell_width(sheet_index):
 def get_cell_height(sheet_index):
     if sheet_index == SHEET_UNIHAN:
         return H_UNIHAN
+    if sheet_index == SHEET_EMOJI1:
+        return H_EMOJI1
     if sheet_index == SHEET_CUSTOM_SYM:
         return SIZE_CUSTOM_SYM
     return H
@@ -575,5 +590,8 @@ def index_y(sheet_index, c):
         SHEET_OGHAM_VARW: lambda: (c - 0x1680) // 16,
         SHEET_COPTIC_VARW: lambda: (c - 0x2C80) // 16,
         SHEET_CYRILIC_EXTD_VARW: lambda: (c - 0x1E030) // 16,
+        SHEET_MATHS1_VARW: lambda: (c - 0x2200) // 16,
+        SHEET_EMOJI1: lambda: (c - 0x1F600) // 16,
+        SHEET_ENCLOSED_ALPHNUM_VARW: lambda: (c - 0x2460) // 16,
         SHEET_HANGUL: lambda: 0,
     }.get(sheet_index, lambda: c // 16)()

demotext_unaligned.txt

@@ -132,6 +132,7 @@ How multilingual? Real multilingual!
 ⁃ Cyrillic Supplement
 ⁃ Cyrillic Extended-A/B/C/D
 ⁃ Devanagari
+⁃ Enclosed Alphanumerics
 ⁃ Enclosed Alphanumeric Supplement
 ⁃ General Punctuations
 ⁃ Georgian􏿆ჼ􀀀
@@ -151,6 +152,8 @@ How multilingual? Real multilingual!
 ⁃ Kana Extended-A
 ⁃ Small Kana Extension
 ⁃ Letterlike Symbols
+⁃ Mathematical Operators
+⁃ Miscellaneous Technical
 ⁃ Number Forms
 ⁃ Ogham
 ⁃ Optical Character Recognition

src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt

@@ -328,6 +328,7 @@ class TerrarumSansBitmap(
     init {
         atlas = GlyphAtlas(4096, 4096)
         var unihanPixmap: Pixmap? = null
+        var emoji1Pixmap: Pixmap? = null
 
         // first we create pixmap to read pixels, then pack into atlas
         fileList.forEachIndexed { index, it ->
@@ -373,6 +374,10 @@ class TerrarumSansBitmap(
                 // defer wenquanyi packing to after all other sheets
                 unihanPixmap = pixmap
             }
+            else if (index == SHEET_EMOJI1) {
+                // defer emoji1 packing to after all other sheets
+                emoji1Pixmap = pixmap
+            }
             else {
                 val texRegPack = if (isExtraWide)
                     PixmapRegionPack(pixmap, W_WIDEVAR_INIT, H, HGAP_VAR, 0, xySwapped = isXYSwapped)
@@ -418,6 +423,14 @@ class TerrarumSansBitmap(
             it.dispose()
         }
 
+        // pack emoji1 as a contiguous blit (fixed 17x16 cells, 2px top/bottom padding)
+        emoji1Pixmap?.let {
+            val cols = it.width / W_EMOJI1
+            val rows = it.height / H_EMOJI1
+            atlas.blitSheet(SHEET_EMOJI1, it, W_EMOJI1, H_EMOJI1, cols, rows)
+            it.dispose()
+        }
+
         // make sure null char is actually null (draws nothing and has zero width)
         atlas.getRegion(SHEET_ASCII_VARW, 0, 0)?.let { atlas.clearRegion(it) }
         glyphProps[0] = GlyphProps(0)
@@ -446,6 +459,7 @@ class TerrarumSansBitmap(
     }
 
     private val offsetUnihan = (H - H_UNIHAN) / 2
+    private val offsetEmoji1 = (H - H_EMOJI1) / 2
     private val offsetCustomSym = (H - SIZE_CUSTOM_SYM) / 2
 
     private var flagFirstRun = true
@@ -617,6 +631,8 @@ class TerrarumSansBitmap(
                     val posY = posmap.y[index].flipY() +
                             if (sheetID == SHEET_UNIHAN) // evil exceptions
                                 offsetUnihan
+                            else if (sheetID == SHEET_EMOJI1)
+                                offsetEmoji1
                             else if (sheetID == SHEET_CUSTOM_SYM)
                                 offsetCustomSym
                             else 0
@@ -728,6 +744,8 @@ class TerrarumSansBitmap(
                     val posY = posmap.y[index].flipY() +
                             if (sheetID == SHEET_UNIHAN) // evil exceptions
                                 offsetUnihan
+                            else if (sheetID == SHEET_EMOJI1)
+                                offsetEmoji1
                             else if (sheetID == SHEET_CUSTOM_SYM)
                                 offsetCustomSym
                             else 0
@@ -884,6 +902,9 @@ class TerrarumSansBitmap(
             SHEET_OGHAM_VARW -> oghamIndexY(ch)
             SHEET_COPTIC_VARW -> copticIndexY(ch)
             SHEET_CYRILIC_EXTD_VARW -> cyrilicExtDIndexY(ch)
+            SHEET_MATHS1_VARW -> maths1IndexY(ch)
+            SHEET_EMOJI1 -> emoji1IndexY(ch)
+            SHEET_ENCLOSED_ALPHNUM_VARW -> enclosedAlphnumIndexY(ch)
             else -> ch / 16
         }
 
@@ -1010,6 +1031,7 @@ class TerrarumSansBitmap(
         codeRangeHangulCompat.forEach { glyphProps[it] = GlyphProps(W_HANGUL_BASE) }
         codeRange[SHEET_RUNIC].forEach { glyphProps[it] = GlyphProps(9) }
         codeRange[SHEET_UNIHAN].forEach { glyphProps[it] = GlyphProps(W_UNIHAN) }
+        codeRange[SHEET_EMOJI1].forEach { glyphProps[it] = GlyphProps(W_EMOJI1) }
         (0xD800..0xDFFF).forEach { glyphProps[it] = GlyphProps(0) }
         (0x100000..0x10FFFF).forEach { glyphProps[it] = GlyphProps(0) }
         (0xFFFA0..0xFFFFF).forEach { glyphProps[it] = GlyphProps(0) }
@@ -2559,6 +2581,8 @@ class TerrarumSansBitmap(
 
         internal const val H = 20
         internal const val H_UNIHAN = 16
+        internal const val W_EMOJI1 = 17
+        internal const val H_EMOJI1 = 16
 
         internal const val H_DIACRITICS = 3
 
@@ -2618,6 +2642,9 @@ class TerrarumSansBitmap(
         internal const val SHEET_OGHAM_VARW = 48
         internal const val SHEET_COPTIC_VARW = 49
         internal const val SHEET_CYRILIC_EXTD_VARW = 50
+        internal const val SHEET_MATHS1_VARW = 51
+        internal const val SHEET_EMOJI1 = 52
+        internal const val SHEET_ENCLOSED_ALPHNUM_VARW = 53
 
         internal const val SHEET_UNKNOWN = 254
 
@@ -2691,6 +2718,9 @@ class TerrarumSansBitmap(
             "ogham_variable.tga",
             "coptic_variable.tga",
             "cyrilic_extD_variable.tga",
+            "maths1_extrawide_variable.tga",
+            "emoji1.tga",
+            "enclosed_alphanumeric_variable.tga",
         )
         internal val codeRange = arrayOf( // MUST BE MATCHING WITH SHEET INDICES!!
             0..0xFF, // SHEET_ASCII_VARW
@@ -2744,6 +2774,9 @@ class TerrarumSansBitmap(
             0x1680..0x169F, // SHEET_OGHAM_VARW
             0x2C80..0x2CFF, // SHEET_COPTIC_VARW
             0x1E030..0x1E08F, // SHEET_CYRILIC_EXTD_VARW
+            0x2200..0x23FF, // SHEET_MATHS1_VARW
+            0x1F600..0x1F64F, // SHEET_EMOJI1
+            0x2460..0x24FF, // SHEET_ENCLOSED_ALPHNUM_VARW
         )
         private val codeRangeHangulCompat = 0x3130..0x318F
 
@@ -3105,6 +3138,9 @@ class TerrarumSansBitmap(
         private fun oghamIndexY(c: CodePoint) = (c - 0x1680) / 16
         private fun copticIndexY(c: CodePoint) = (c - 0x2C80) / 16
         private fun cyrilicExtDIndexY(c: CodePoint) = (c - 0x1E030) / 16
+        private fun maths1IndexY(c: CodePoint) = (c - 0x2200) / 16
+        private fun emoji1IndexY(c: CodePoint) = (c - 0x1F600) / 16
+        private fun enclosedAlphnumIndexY(c: CodePoint) = (c - 0x2460) / 16
 
         val charsetOverrideDefault = Character.toChars(CHARSET_OVERRIDE_DEFAULT).toSurrogatedString()
         val charsetOverrideBulgarian = Character.toChars(CHARSET_OVERRIDE_BG_BG).toSurrogatedString()